Machine for turning oval frames



UNITED sTArEs PATENT ernten.

'ISAAC P. TICE, OF BALTIMORE, MARYLAND.

MACHINE FOR TURNING OVAL FRAMES.

Specification of Letters Patent No. 31,837, dated March 26, 1861.

To all whom it may concern:

Be it known that I, ISAAC P. Tron, of Baltimore, in the county ofBaltimore and State of Maryland, have invented a new and ImprovedMachine for Turning Oval Frames; and I do hereby declare thatv thefollowing is a full, clear, and exact description of the same, referencebeing had to the annexed drawings, making a part of this specification,in which- Figure 1 is a vertical section of my invention, taken in theline a2, se, Fig. 2; Fig. Q, a plan or top view of the same; Fig. 3, aninverted plan of the same; Fig. l, a diagram showing different positionsof the frame in the course of its rotation. y

Similar letters of reference indicate corresponding parts in the severalgures.

The object of this invention is to admit of a rotary cutter or astationary chisel being used to cut out oval frames automatic-A ally orwithout the usual manipulation of a cutter as used with the ordinaryoval lathes.

In'order to turn or cut outoval frames with a rotary cutter head or astationary chisel, it is necessary that the cutter or chisel have aposition at right angles with the face of the work at all points of therotation of the latter in order that the moldings or beads may be cutperfectly. This result cannot be attained by an ordinary oval lathe, asthe work in such a machine has a rotary motion only and the cutter headwould have `at certain points of the rotation of the frame, an obliqueposition with the face of the work and the moldings and beads of thelatter would be destroyed. To obviate this ditliculty I give the bed ofan ordinary oval lathe a vibratory movement simultaneously with itsrotating one, substantially as hereinafter described, whereby theposition of the work changes relatively with the cutter head or chiselso that the latter will at all times have a position at right angleswith the face of t-he former.

To enable those skilled in the art to fully understand and construct myinvention, I will proceed to describe it.

A, represents a platform which is supported at a suitable height by legsa, and B, is an annular guide or way which is formed on or attached to aplate C, said plate being secured at one end by a bolt D, to the bolt'or platform E, is a vertical shaft which passes through the plate C,eccentrically with the annular guide or way B, and to the upper end ofthe shaft E, there is attached a rectangular block F, which is fitted ina guide G, that is attached to the under side of a bed H, on which thework or stuff to be4 operated upon is placed. The bed H, is fitted onparallel ways Z2, b, which are secured to traverse bars c, c, the innersides of which are curved or are made concave and are fitted on or tothe circular guide or way B. The guide G, which is at the under side ofthe bed I-I, has a position at right angles to the ways o, l), on whichthe bed I-I, is placed.

To the lower end of the shaft E, there is attached a toothed wheel I,and into this wheel a pinion J, gears, said pinion being on a shaft K,which has a crank pulley L, at its lower end, a rod M, being attached atone end concentrically to pulley L, and the opposite end attached to theplatform A, see Fig. 3. The shaft K, is fitted in the plate G.

At one end of the platform A, there are two uprights N, N, which areconnected at their upper ends by a cross piece O, on which the bearingof a horizontal shaft P, is placed. On this shaft P, a cutter head Q, isplaced, said cutter head extending over the bed H. The cutters d, d, mayhave their cutting edges of any form corresponding to the desired formof the work to be cut.

The operation is as follows. The shafts E, and P, are rot-ated by anyconvenient power, and the stuff B, to be operated being got out inproper form issecured to the bed H, in a proper relative position withthe cutter head. As the shaft E, rotates the bed H, has an elliptical oroval movement given it in consequence of the eccentric position of shaftE, with the annular guide B, and the sliding movement which is allowedthe bed on the ways o, o, in connection with its rotary movement.Besides these movements of the bed a vibratory movement is given itthrough the medium of the pinion J, and rod M. This vibratory movementis given the plate C, and it changes the position of the work or stuffB, relatively with the cutter head so that the latter will always have aposition at right angles with the face of the work. This will be fullyunderstood by referring to Fig. 4, in which the black lines a* show theposition of the cutter head if the bed H, had the usual ellipticalmovement only. These lines ax, it will be seen at certain parts of thework, indicated at 1, 2, 3,

are quite oblique with the face of the work,

while at other points, indicated by 4, 5, 6, 7 and 8, they are at rightangles with the face of the work. This oblique position of the cutterhead relatively with the work prevents the work being properly done, thebeading or molding would be marred or cut away so as to completelydestroy the work. By giving the vibrating movement however to the bed,the cutter head is always kept at right angles with the face of the workas indicated by the red lines bx, the work R, assuming such a positionrelatively with the cutter head to produce such a result. The shiftingof the position of the work R, relatively with the cutter head varies,or in other words, the vibratory movement of the bed H, is not constant.This result, which is wanted, is due to the changing of the position ofthe wrist pin CX, of the pinion-J., relatively with the bolt D, as thepinion rorotates, the pin cx, being nearer the shaft E, and bolt D, (asshown in red, Fig. 3,) as the l long sides d", of the work passunderneath the cutter head, and the motion of the bed will be quickerwhile the long sides of the oval are passing under the cutter head.

Thus .it will be seen that by this very sim: ple arrangement oval framesmay be turned with a rotary cutter head or with a stationary chiselwithout the usual handwor'k, for ,l

a chisel or tool may be made with a cutting edge to correspond in formwith the desired form of the work to be done, and said chisel or toolsecured to the cross piece O.

I do not claim the bed H, arranged to rotate and slide so as to work inan elliptical path, for that is an old and well known device commonlytermed an oval lathe but,

I do claim as new and desire to secure by Letters Patent,

The giving of the bed H, of an oval lathe a vibratory movementsimultaneously with its rotating and sliding movements so as to admit ofa rotary cutter or a stationary chisel having at all points of therotation of a the work R, a position at right angles with the facethereof substantially as described.

I. P'. TICE.'

